Home / 13,421.87-20,132.80-4,187.87

Finding the Fourth Proportional to 13,421.87, 20,132.80 and 4,187.87

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Solution

The fourth proportional to 13,421.87, 20,132.80 and 4,187.87 is: 6,281.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.87 : 20,132.80 = 4,187.87 : x
  2. Step 2: Convert to fraction form
    13,421.87/20,132.80 = 4,187.87/x
  3. Step 3: Cross multiply
    13,421.87x = 20,132.80 × 4,187.87
  4. Step 4: Simplify right side
    13,421.87x = 84,313,448.47
  5. Step 5: Solve for x
    x = 84,313,448.47/13,421.87
  6. Step 6: Final answer
    x = 6,281.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.